Jack



Nov. -20, 1923. l,475,0547

S. ELLl NG\SEN JACK Filed Aug. 16 1919 2 SheejLS-Sheet 2 YHTORNEY.

Mmmgm i Patented Nov. 2Q, 1923.

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JACK.

Application filed August 16,Y 1919. Serial No. 318,022.

To all 'whom it may concern.'

Be it known that l, SIGURD ELLINGsnma subject of the King of Norway, residing at North Vancouver, British Columbia, in the county of Vancouver and Dominion of Canada, have invented new and useful Improvements in Jacks, of which the following is a specification.

This invention relates to improvements in lo lifting jacks and has special relation to jacks used in logging.

An object of the present invention is to provide a jack for this purpose in which the lifting power materially increased through a novel form of ratchet mechanism, which is so arranged as to permit of a wide range of movement, the lever being capable of movement a distance of approximately ninety degrees, or from a vertical to a horizontal position.

Another object of the invention is the provision of a jack in which the casing is of integral formation to provide strength and durability, the Construction being such, however, as to permit of a ready removal of the working parts of the jack, when necessary or desired.

A further object is the provision of a ack casing in which the lifting elements and the operating elements or ratchet mechanism are contained in separate chambers formed within the casing and divided by a partition to define guide walls for both the lifting and operating elements.

Other objects and advantages of the invention will appear as theJ following description is read in connection with the accompanying drawings.

In the drawings:

Figure 1 is a side elevationof a jack embodying the present invention.

Figure 2'is a front elevation of the same.

Figure 3 is a plan view.

Figure 4 is a vertical sectional view on the line 4 4 of Figure 2.

Figure 5 is a similar viewl on the line 5*-5 of Figure 2.

Figure 6 is a horizontal sectional view on the line 6-6 of Figure 2.

Figure 7 is a detail view of the clevis.

Referring to the drawings in detail, wherein like characters of reference denote corresponding parts, the jack is shown as made up of a casing designated generally at 10 and which is mounted upon a supporting base 11, the latter having depending flanges 12 and being removably secured to the casing through the medium of bolts or screws 13, which pass through openings pro- .vided in the said base and in the lower end of the casing 10.

The casing is of integral formation and divided into separate chambers 14 and 15,

the former kextending throughout the length of the casing and being adapted to receive 1 the lifting element, to vbe hereinafter described, while the chamber 15 is positioned lto one Yside of the chamber 14, and extends only for a portion of the length of the cas ing the two chambers being divided by a in the outer walls of each of the chambers and being received within bearing caps 19, removably secured t0 the said outer walls through the medium of screws or bolts 20.

Mcunted'for movement within the chamber 14, is a rack bar 21, one rear side of which is provided with teeth 22, which engage teeth 23, formed on or secured to the shaft 17 intermediate its end, so that a rotation of the shaft, by means to be later described, will move the bar longitudinally of the chamber. The lower end of the `bar is provided with a projecting toe 24, which operates within a slot 25 provided in front of the casing, while the upper end of the said bar has removably secured thereon a gripnut 26, thus enabling either end of the bar 21 to be used for lifting and adapting the jack for use in a wide variety of places. Y

Mounted upon the shaft 17 within the chamber 15, is a ratchet wheel 28, the hub of the said wheel being provided with a hexagonal socket 29, for engagement with a similarly shaped enlargement 30,` provided upon the shaft 17Vto one side ofthe teeth 23. This permits the ready removal or positioning of the ratchet wheel upon the shaft, by simply sliding the latter transversely of the wheel.

Mounted upon the shaft 17, and operating over the ratchet wheel 28, is a clevis 31, which comprises spaced plates connected together at one end by means of a web 32. Each, of these plates is provided with an opening, the latter being concentrically arranged with respect to one another and of CTI 'ment 30 and the teeth 23. Mounted between the plates of the clevis 31, upon a pivot pin 36, is a dog 37, which is adapted to engage teeth of the ratchet wheel 28, and is provided with a linger piece 38, which projects beyond the clevis. The dog 37 is normally pressed into engagement with the teeth of the. ratchet wheel through the medium of a spring 39, which is secured to the clevis.

Pivotally mounted between ears 40,- provided on the casing 10, as indicated at 41, is an operating handle 42, the latter being bifurcated, as shown, and receiving within such bifurcation one end of a link 43, a pivot pin 44 serving to connect kthe link with the operating handle. The opposite end of this link is pivotally mounted upon a pin 45, between ears 46, formed in each of the plates of the clevis 31. VThis provides a wide range of movement for the handle 42 and affords increased leif'erage for the operation of the ack.

To prevent retrograde movement of the' ratchet wheel 28, there is pivotally mounted within the chamber 15, upon a pin 47 a dog 48, which is urged into engagement with the teeth of the ratchet wheel through the medium of a spring 49, carried by the dog. The latter is also provided with a finger piece 50, which projects without th-e chamber 15.

It is believed that when the foregoing description is read in connection with the accompanying drawings, the construction, operation and advantages of the invention will be apparent. The right is reserved to make such changes in the form, proportions and minor details of construction as properly fall within the scope of the appended claim.

Having described the invention, what is claimed is:

A jack comprising a casing divided into separate chambers, a toothed lifting element mounted for reciprocation in one of said chambers, a shaft mounted for rotation in the other chamber, teeth carried by the shaft intermediate its ends for operative association with the teeth in thelifting element, a ratchet wheel surrounding the shaft and secured thereto adjacent the teeth thereon and being arranged in the last mentioned chamber, a clevis including spaced plates arranged on opposite sides of the ratchet wheel and each being provided with an opening of a different diameter, said openings being adapted to fit shoulders of like diameters on the shaft and being concentrically arranged with respect to one another, a web connecting the plates adjacent the upper ends, a handle pivot-ally associated with the wall forming the respective chambers, means pivotally associating the pivoted end of the handle with the clevis and manually operated dogs liXed to the wall andclevis respectively and being associated with the ratchet wheel as and for the purpose specified.

In testimony whereof I aiiX my signature.

SIGURD ELLINGSEN. 

